Originally Posted by: Lao_Tzu...i dont pay for the facilities on this site music should be free for everyone :)

Er.... no. If people didn't pay for anything, I wouldn't be able to buy my dinner. Why should it be free?

Anyway...

Do a search on google for 'Diatonic Harmony' and you'll get the answer. Also, look at the intervals of scales. For instance, a major 7th chord is just a standard major triad with the seventh note of the scale added.... Diatonic harmony is also the route to the modes....